[Question] 1975 Sanger Floor
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1975 Sanger Floor

  1. #1
    Lee
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    Default 1975 Sanger Floor

    I am redoing the floor in my Sanger 19 bubble deck been doing a lot of reading and seem to find different opinions. So first off what would be the best way to adhere the plywood to the glass on the bottom? And what matting and cloth should I use and how many layers of each. The stringers are mounted on top of the plywood should I use epoxy to adhere stringers to plywood or poly resin? This is probably not the right forum. Just looking for some answers of what has worked well for some of the others any input is greatfully appreciated.

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    Hoodys and swim trunks Elkidminoltu's Avatar
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    First, pics help alot!

    You are going to see many differing opinions but what'll matter is what you feel comfortable with doing at the end of the day. I personally used epoxy resin mixed with cobosil and cotton flock to make a paste and "glue" my stringer to the floor before glassing over it. I then went over it with 2 layers 1708 biaxial mat which has woven roving and chopped mat layered in it. The first layer should extend about 3" past the stringer where it meets the hull and the 2nd layer should overlap it by another 3" (6" total from stringer). You can do these two layers in the same night so long as the first one flashes over (almost dry). If you let it sit overnight you will need to sand off the "wax" layer that develops on the top of the resin when it dries or the next layer won't stick. Be sure to work all bubbles out with a roller/squeegee/paint spreader/etc.

    1708 is thick shit so you'll use ALOT of resin to saturate it completely. I personally used 3.5 gals do to a single stringer and 42" wide floor in an 18' boat.

    If you go with a more traditional layup, you should layer chopped mat, and some heavier wt woven fiberglass repeatedly to build the layers. They say this is the strongest way to go.


    Quote Originally Posted by Lee
    The stringers are mounted on top of the plywood
    I've never heard of stringers being layed on top of plywood before. The stringer is the main structural component to provide stiffness in a boat so they are usually layed directly to the hull. The plywood is then cut and sandwiched in-between the stringers to form secondary structural component. I would look more closely to verify. Do you know if they've been replaced before? (No telling if a previous owner knew what they were doing).

    This is how I understood it and did it on my boat. I hope others chime in with more experience and correct any information I may have gotten wrong.

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    Lee
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    Default Sanger floor

    Yes this appears to be the original floor Just seems odd the stringers were mounted on top of plywood. However there was a post in glass forum of a guy that worked at sanger those years and made mention of this. Even found a nickle (same year) under laminate near transom probably what started the delam .LOL. Previous owner had one hell of a motor in it and it held up so must work. I have no intentions of making this a race/show boat just want it to be stong as it once was. Will get pics on soon Thanks.. Mike Lee

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    Dave....its not a jet boat!!
    "If you can't dazzle them with brilliance...Baffle them with bullshit"

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    Bah... HST4ME's Avatar
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    Stringers should be bonded to the hull itself and nothing else under normal situations. Post up some pics and I can point you in the proper direction.

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    Senior Member harley222's Avatar
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    hey this is the guy who bought bills old boat (the violater) this is the boat hes talking about...
    good luck mike

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    just a word of caution put them in like they are and use the old ones for templates Make sure when you cut them out that you have proper support under the area where the stringers are or else you will have a mess-read a couple of threads in the Paint and fiberglass forum and you may want to pm Harlan Orrin he was the glass shop supervisor for Sanger ,he will have a few good points on the project for you it's not really that hard,just takes time and patience.......
    Last edited by mdsheppie; 10-06-2011 at 03:23 PM.

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    Lee
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    Default Sanger Floor

    Harlan is the one that has the post in the glass section that said they were laid on top of plywood. And said he worked at Sanger from 1970-1975 as production supervisor so that would be when the boat was built so he would know. I will pm him. Hope to get a few pointers he did note in previous post on supporting while doing floor and stringers. And I have spent more time removing stringer as to not destroy it to use as a template other one is still in the boat prefer to do one at a time to keep this in the right form. Just always thought stringers were to the hull itself.

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    ah they knew how to build em. another good source as for how to lay the glass is offshore ginger another good pm to him wont hurt. hes in Michigan and worked for Skater for a million years he has helped a couple of guys in the mitten more than once when they were doing what you are

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    Senior Member The Violater's Avatar
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    Glad to see that you are doing a nice structural restro on the Sanger !!! Strikes me as odd that the stringers were laid on top of the plywood, however that was most likely a fast efficient way to build them. Just fit one or 2 pieces of plywood glue them down and glass the stringers in on top. Keep in mind that the thought process was that the 'good times' would never end and people would just buy another boat in 5 years and Sanger would just keep making them !!! They never figured on them being restored 30 to 40 years later. The way they do them now if you have the money is carbon fiber stringers and matting, then it will never rot !!!! Also check into the West system and the vacuum bagging system. It was invented and is marketed worldwide by the Gougeon Bros. in Bay City. I believe Meade Gougeon published a book called 'The Gougeon Brothers On Boat Building'. It deals with Sailboats but the principles apply. I personally would Glue the stringers directly to the bottom of the boat fit 3 pieces of plywood rt/center/lft. and use the west system bagging process. It uses total atmospheric pressure it is impossible to end up with air pockets. When you pull the plastic up you also will have a mirror finish. I have never done one but know people whe have done 40 foot sailboats. Thats my .02 send some pic's !!!! Keep the info coming.
    / The Few The Proud TheBlown

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    If it helps I have a copy of the book you can borrow gimme a call I am not far away Ken(Shep) 2486274465

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    Lee
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    Default Hey thanks everyone

    Good to hear all possibilities. Harley was right lot of help here. spend a lot of time reading articles. Like I say this thing will never be a showboat but not everyone has one either just want it to stay together something about that driveshaft being so close LOL. Bill we have to meet sometime .shep Thanks and will pm ginger also.

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    Senior Member harley222's Avatar
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    Mike i have said this over and over, this is the best group of guys i have ever meet. The people in this group are here to help keep this sport going and help as much as needed. The guys here are the best i have ever meet, theres no end to the knowladge that is in this group of men. keep up the good work, post pics and get ur tail to some meets........

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    Senior Member OFFSHORE GINGER's Avatar
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    Mike , i got your P.M.,and sent you an e mail . Mike , first off forget West Systen , because they are way to pricey and really not worth the money and when making a fillet to bond your stringers to the hull.... forget the cotton flock because all you really need is Cabosil and resin , and when it comes to how many layers of fabric i use for stringers well ................. normally i go with a total of three layers staggered which is a practice i picked up at Skater considering most Skaters are running triple digits . Mike , just curious how thick are those stringers and are you going to go with a good marine ply or something that will never rot like Coosa but a little more pricier http://coosacomposites.com/bluewater.html Hey guy i can talk you through this whole thing which really is a walk in the park ,and if you get a chance go to this link http://www.uscomposites.com/epoxy.html because they offer far better prices then west system on there Epoxy Resin which is there # 635 although i normanlly use the same resin that Skater use's and another made by Plasco Corp in Remo Mich i think you will find that there prices for some material's are very easy on the wallet , and hope to talk with you soon
    Last edited by OFFSHORE GINGER; 10-07-2011 at 11:16 AM.

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